N was about 11 months and I decided to try to play "Where is the...?". I was so excited when she was able to do it (I wasn't sure if she would catch on).
To play, put a few objects in front of your baby or on their highchair tray (I started with 2 objects and increased after that). Ask your baby, "Where's the cow?". When they point to it or grab it celebrate like crazy. If they aren't sure, grab the cow and say "Here's the cow!" and then keep repeating until they get the hang of the game.